docs: def verify_logout_request(cls, logout_request, ticket):
          """verifies the single logout request came from the CAS server
          returns True if the logout_request is valid, False otherwise
          """
          try:
              session_index = cls.get_saml_slos(logout_request)
              session_index = session_index[0].text
              if session_index == ticket:
                  return True
              else:
                  return False
          except (AttributeError, IndexError):
              return False